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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98ccfa41c795ab0d55e986bc87d13cc2f0c1f3ec41d62e4f8f1568043277f21' 
  AND token = 'M3VKB390uoA6OHj4yy81D4QtdB0DNXuyTiTa2dnx9PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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