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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbfec0dab5773ee8705ea472bde50e034e817d5fa70807fbdf95b7c27473872' 
  AND token = '6sKyTgR27k/ho4JsGhTCKJNvkVjZrBRnOwH4Vps8paM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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