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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c6aaf4e844fbeb3d92a80574a99590ee307a8b05f231a29eca2cb54d1ed6ff' 
  AND token = 'p+0WdwNP2oYPL7jpvfo/esoMWLBSv5myXtrXCyK65ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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