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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d610a36a222ae362beb6e2032dfc5459cfec775a15939b8112219b62e627ef1' 
  AND token = 'YdSiB9sjfzokUcj1bR2vJhghyrEeKSSYSUlq5hha+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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