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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3273ac9a2f6935ea057fb0bec9cb18f4be5e84a4430dce98b68b83a816d697d' 
  AND token = 'WlYvrUxpyvP8ir72RM4zJHuoGAmHTo33kzBhx2Yoqdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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