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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e728078a984022411ff004504064affee7e959dc9c47cac6d3519a97078b102b' 
  AND token = 'ytu/tIuWBqilhpUcyErFAAF0WOIC+TaRqHVEEXdsfVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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