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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b82c9fceb020083515fd106d751518ec546c5ed9b23b0b72b49c8cc5648cdf' 
  AND token = 'fqOsJDRjycuVP1WcJ1sZQe1ds5gr1NqMAzLMw799bMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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