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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd087471a9627445bcee9f6072bf35d6e912af234ea3eb7391028296d1898705d' 
  AND token = '0O6Ms10OX19h/FEbq/jZt6VSJknLz2Vf5XVJ7xNUWm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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