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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54de36ff0ab5802be97e5a55a3fd03925148481853ebae321cd446c3d41d92c' 
  AND token = 'J7wiccSFT4Awoin0Iy5HA9l85gVnEWEOGdXHOzsIR7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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