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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9bd7c43e6cab596f2a6bd5afd8cee3c6ef408011b4d723b8c23e3ae541b018' 
  AND token = 'saxXcXwawhp4WugevVmOVVs3vQ9+ssLkxvqql6679Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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