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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d229a15a12e757f1762fa7f9bec9fd3207f6975093ebda497ba6c496c84de85' 
  AND token = 'E5AEX2DF2/9YkisfZJC4wMZIsbilafuNeJFSlFXTIGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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