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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a018009ca15db6c73d13d0798ab602dd3999391a83ca565c3cf006186c3b5796' 
  AND token = 'Cyc+/H7Lv2NPi18f/SYXwOCMNtbVM9HIERuUA9TbEWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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