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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ccd0d70470caa9c716e3b1dbede420c5f8d1e164f38fc89b379bdcdfccfd99' 
  AND token = 'SztlGWcj7Cy0DvL9cmNXuuDye4cURrPbBrpXFNtOrFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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