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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c75faf8e420e9c3b14699210670568fdb35c2acdfe831cfb0bc66cbfbf32bba' 
  AND token = 'tf5LBE7t+8qii0rqPi73EqOlsJw3lAcQJXhtthes/YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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