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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49625c804d3239d417b89d2d21634394cd88ceed2f45ed226ae2128fc259bbcd' 
  AND token = 'NAnQU/FJnb1s8Mjz/YG7XktVriHvdhwaBb0hRm5DxCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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