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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329e74b84b08f9f4c9c6d52b6518a3d9021aeabfcd1194485f304576053be98d' 
  AND token = '+3b7jTsfGmEctP+fOpYDDuNknsc77qayvQRhjGjO4uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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