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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b43796bf614853c79a3afc822e9deedf1c47b072452451d229bcba0cd7a5c2' 
  AND token = 'gFKCRHC+IcwTRM8gTw7Opo++OnHRtPgh+2h5k0USWW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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