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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8dcc3e5372c0cb2700d2d7bc50a0930a2e3faee4011f55d9ffa4ad82639b94' 
  AND token = 'dhUq4PiF9/OB9bBCnCt8Qc9ZTfTS+XSGsjTi0gRn6Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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