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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93edea14237f532347a5985a10253184e49c7f27cd6a9dd51fcd772c3c54c8b7' 
  AND token = '6YjXMAxWVY8Ft44B6/Dhn9ftX/78jB9G4+9x90npEaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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