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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667ad7524a6d00d6ea14706ce52d0def573e2cf2f6a44e34df37756fca7518ea' 
  AND token = 'loPwgRCTSu2j8WMuYfM6DWGv5TM66tsnVq4m5OE1S7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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