SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f67953bf5876b8726fb9b11e521fe32e4823d6d9d03ccd0bcfd83cb11be18b' 
  AND token = 'UKgBE9N6YTn+GbNGllV/fr5yrDa8Mu1QrabCnk2ZSYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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