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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0deb40bedf53839725ac39673667fe0aef4b0a97229f75aa91aca3fcf763cb4' 
  AND token = '1BtUfOprmfHvj+LcyEUiJJs6KRBhZzfLcy0kjy6BdQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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