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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b166084005d5427bf04a7603da576b7e22f486fdf84eaa06adb96bb121239a' 
  AND token = 'b9zwgExzwnPl0hHxU1jUvwAqWYpxwZmhI2boQ6ASyPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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