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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdf9f05749a94b117e9094d087ed36ba15ed29d72ea15b7a84af45ec4a47f9c' 
  AND token = '8DobPQCOz0HWBnUChxDthNN/40u7QExv2oHYS2ENvIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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