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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0aac904c323c79e9f8b1c5ea44bd6a55bef2ec754160138ef6de0c563601dca' 
  AND token = 'Eq9vsyJ9LxOTdmSK1cH+K30QQ9yay1eQdEH9O+MYIvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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