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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a540aee04a28e1b799e7b967496a6ea9eb61ed7b3d1688e2cfec4cfb6af9868' 
  AND token = 'pHWRcUQLp7FT5U56YnEV7FnxML2akKRd8i+z6LNxIzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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