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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999ac360522a5b42a0ab4dc409bea78c841c0e40a77660e582cdc9c5a59bf1ab' 
  AND token = 'G03cZIB4WV5GMCHmExG2zJac150ETaEjbgY7pSwNHLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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