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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df0a4ac7cf7d91d9b2e768670016f6744a8b5924e8119215d40b90c0b52a453' 
  AND token = 'jyBel+V7lVLn5467yFw167Dzu9IzkXB63x1HP+0G7Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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