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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5884f1c88c850f23f6d9b16017acda307ea32493f6fa288d2a9a9f43d24539' 
  AND token = 'cCqf1wKTpTE40h/Viec9Ly9Ih7YExdLy6ZVqJFHkiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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