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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d5458c16aa0af513e26f18a20887ac67c20cb63dda61fe589e923f7c35f299' 
  AND token = 'd92j9GtJnX8ow5BlQC9D8/LcBPNHwMudeVkipFjhqAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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