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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fafb69b5e50aaa38ad5dd15fdaaf151708f636e750e89ae4205db6b4e5d84d6' 
  AND token = '2aO0PNpITDBD4i6E9dzIK3GJyZnhLYa8RK+yIHaQj/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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