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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea94bfb2f6545fe7790b81e6afee7276183e8c301cb403c13207c2a799082ae' 
  AND token = 'wUGNzYwwyHiLEfY74z17sZwOI29S3BEizDMMRSauqw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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