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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbe4b65e0bd7322d80f5e418ba811b5a625db73fdfbda41f4975cacbcbb5f1c' 
  AND token = 'z/g4MNCc5qYwZQdRXhAti8wqa/0ISLYg3TVIEdcfqtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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