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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76855ce7fe40f22c12011e20e40fdf650a77a8d5ede60a050cc14dba1110009b' 
  AND token = 'rxv02vW4UI6ha+KFlaAHVaO5jA7nthiwEAD3UOZ1F6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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