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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5c7a71ec8922662932bbe75832dbcfd6d6ab69217b6c2ca58d48cce5d53172' 
  AND token = 'INfF2oNVMU4MZqNI/yFqJwRlChlDeMGA4oOiILSQLl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}