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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356ff18c88c3edd7ced5f350b333283dedea0746dcfb72043babfa9f6b4fbbdb' 
  AND token = 'G0ETf4eO+ozfueIyyulmijj/W9+qqh3LfvjreOoo7xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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