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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf9e462e14f383988e6cd1db49cb0d9539d6d7082bb8d10805637b33cc58a7c' 
  AND token = 'Yd8ZGwXGae83APgPWfLWu9gZXdtNxfbGiBypbrdoYco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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