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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728d4dc8f3e6e0dd114ed669dcfd33870faac570a3a5c3b8dbe4fe04ec8b3ef2' 
  AND token = 'q5miTXuO+UNTA6gjokg4o236AiK8RdZTn3iqMDY9hy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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