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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c6fb3df9c27679cd5e0ec9206ecf9c7f1dd7d8a1676a30ac888b4385fe02cc' 
  AND token = 'FW0K9QNg26bErIQ5g5evQOVTcq3Nlxz0ldV88BqqwxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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