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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4fd157c808e336e34984a991638c130e148fd31e02ac846eb79bd6cbc93da6' 
  AND token = '/LcuIr/rYW4VR9zqSS7TncbqGCUlfh4etafJMosP8Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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