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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5830f3367cd399bfa598516a2632bee0846692f89250eeb3b0422944faa01235' 
  AND token = 'e00zT2xrs3XBrBcy7WdVEBZZpVTLaQNQzT6qPUtrSZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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