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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dda627e53c38ad2d670c6ab9b8a9c7004a1264cd072824f7626c5cf952a8b60' 
  AND token = 'xJjXj9Ta9goAVmD/Sar4ldcYsn4K15OG/RZ2NrnqHFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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