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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b98d1cd55f9499f690820a7b67dd655fd0a22b7718e2f968e6fa2698f8dd470' 
  AND token = 'cqegbs4X/reahlI9FemCxdwgkwyyIt72Lg/6YhL2cmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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