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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b8cc965030e1da04fe8e0b00327fe7def20fa989c1d771b82a8835ebee530f' 
  AND token = 'FXxwCD35idMs7bGV2qWnzl2M/nGpgT59PTMnPC/WNh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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