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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa08da022886bd5ceec240df0e684b97cd9151c331858c2e926af601c1326c3' 
  AND token = 'rf6GqD5hpGg/Z/3QMuNawJD7+WuHcyKtv4GJNpLoTo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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