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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096f52453fa8cb11521545f8dc26f1c692e11d7134e3198b44ea809e2974ab83' 
  AND token = 'lDstUni65I2b1KloT9c93HtXNesvZqk5G9req4OQBbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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