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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6e22f8f940a818b67c03ee1450ff7dba3bc42a25f6e63efffb86e21072c7ec' 
  AND token = 'Dg+ahT11hq3btPqO7PZasLpZr9sZ5ajoaZqKxqiRi6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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