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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2a3dc8a1c681acf59ce78ff88798ef29166dfb7d18f55f56c9bdd0ca8ce4a7' 
  AND token = 'WfMHU7pwHQXGl6cE38a2G0xyuPIyh+3BzOxwDINwZWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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