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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c472670ebf4ed0dbfd6885a6c7edd34b94b030e41249c1929adb4217004c58' 
  AND token = 'VcCBvHK03fxf3AYLF3GO8PZffE7KRgbLtH7QcjZ0N0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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