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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd39b8910b800278ba4941ca0d7aa203e87f76a5a006ae5c55c086ec2593d9a' 
  AND token = '/GP1GVsJlyli0g9kbZsZOpskTs11B5N9gJn/d3Yl1rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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