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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f562d6ef467865776b1d7dabcd1160873e213e70890bd10ad3b314898be2e23d' 
  AND token = 'p75KtwxmHvBml1oGoXa4v1DIMxeG2m9TfWdJJ2NQ9Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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