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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54570687e674c0089d388ad1281ceafe43f47b318360948d15a9fd406443199c' 
  AND token = 'Ekjgv6+1nvaIrlKELSDUXRFFwOh7Tea/MV/8S/SM/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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