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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755728a40d3651e047dcd44893f391f3ede06d5a96fc3afae7336149599e2886' 
  AND token = 'dPwBeUA/17tzAoWy3LN9AJdmpXaLjme7+Xp/2Knf3hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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