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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2079d6a62cca5f368260d67397515cea4e6033a6888d53eaa18534293c35fceb' 
  AND token = 'Am5trda+wN6i9A4T4BkUpnq+rCuYiUPoeInqX+qxtDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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