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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8519a6d5b91828119f41abe73814fc1c12d5d44466b42cc83458dbdd42d7acf9' 
  AND token = 'P/wDI5Y8gWDC9gChxru+hHTVTlp66bwrKWh2tt4+nXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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