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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa81c3497c52d8d6dfeb659d3a096eebeef8a82ec3ee403e753830a8d929dbab' 
  AND token = 'r0ybFyHx+q77bUGzLg6shb5zJZ0t+oH97S1FZ+W82WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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