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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01369805d5e68fd26f8258ff1f7df7ef632e57819c9f2ff1e4a6f2b4a2290e39' 
  AND token = 'JELOxneVsQ/AQhNxQTHbeVlsf8hHMcW65x1cZHheCcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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