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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa661a445946d168b63c690c61dd2bb0292e71d0f2b8afc00da4997ca7a7fe93' 
  AND token = 'pjlLP0C9r11sM8oM3yTT7ejjM6YCl6HCRhbdiQqpzds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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