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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19673403fa917922baacb2e4479ad5f89e62221ba8147e546d771752865ecb86' 
  AND token = '6Ss2BqZHw0UJo0VyQNcTSyzZsTGSwm5RL3KN+BeSm2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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