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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d08412b5a21e167785f511dbbd120a2052ad6d912109339bc9832160141328' 
  AND token = 'hm3sry3hdmG2/PyycT//OuAA36XjpO69bbfL//6m5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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