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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a006703a35983486e31932efd6e94ae4357dd6905591b536c4e77b3c63c5212' 
  AND token = '120JDOkXbE9nf9T1ruIoHF/SHy9f7PKYeerbIYsnqo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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