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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d24a8faaea14a606fc2ff8d5af2b69673dafacba46c56b2be9c9b78dd14e0a' 
  AND token = 'gUoSn0waEcieOScYrBqKDmO+tra8erbENT8TcP6jwLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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