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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3921d3fd9329806dd4088ea9e7c062f396a4962eb39df9d2914198b222440d48' 
  AND token = 'PsG6l/mCsrBqiXcawOC5F4N0yWTow18CyU+xi0duPDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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