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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c01e2728c8413353b2fd4246564f7199d03234cb897705a7a0b7e806bc4b8f' 
  AND token = 'xzUlqqrlTGeoU84AKwJMmd7zZ7KzcGu/SSIOT40s85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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