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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0676c4129ae1003bc67eb4b172469369049490e3df0ed0cab63804791ae384' 
  AND token = 'YsDiWfF8NCbnzEnaHuH9+dVwc55Glny/SsQyQMRiR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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