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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1317de67dbead7e5af4dbea64c795fb2edec383bedb986a2d07a655a8859486e' 
  AND token = 'UWoIBypaI3VA1L3DhNNsn7N3bxr59YCvHaM4yl6ZErw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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