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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0002196550f62e496697e77d9c1d41f4a35ddccb162b316b43585fe119c39e0' 
  AND token = 'ndpL14onpbV8QulSj5u8+Z57JfAjGivJ29Rik7JtEkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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