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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a0e4bfed404ebf6b8a71897c8fedf92d9563d02b8a710063fae7d9d4d019c2' 
  AND token = '6XhLH9EJDKi28vWlCLQvHZoDDMbPuB+0ty5F/QYRYeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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