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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a386b7a0cd9154b1e1748c9c8eb641ccfe8dc65943e44e69ac25f7c3b30d8a81' 
  AND token = 'Q0MNwBH7K8Xsr1OzGBYjGr3Mh2LEEZfF7linHyScqrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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