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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd4be70ec1b14aab5ab8bd6be0e7780dec68f64e86e33faa859af3c24dd0fe0' 
  AND token = 'FS9IAlw9WiWEcggh/k4f89o/psUOqm0ATba8IAhJniY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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