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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38b3c21562a03d5c2a7314abc960740a754e729d2068de519a227c36a02d736' 
  AND token = '69UzlYV5ZJ9TKktx7dTaraTl9lK8Zv48KKJw77blAhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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