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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9f2088d7710785e970e3070b58b525ecd2bcc9bf657ca03192d12ebdf04b2b' 
  AND token = 'S8IBJVBcqCccxasZZ9yPZrAYn70h0XFFdUBsOEjouF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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