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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830466ae2578fb3db5d0f4b6156e60091914390600b4255e7f7decdbc9af934b' 
  AND token = 'hVJZsu/iuF+lc35sQuPd0NYlVPm6HmGNU0deVMnOofM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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