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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6199f51853e449e81be5a6ff208904fec8e4ec1eec1c4d004bd9bb8650a7f22f' 
  AND token = 'Jka73SMdcW1lAp2T3C1rCLwVQMD2a5Mry8wg5L5l450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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