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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d3bc8b42e95981b529a8b961cc4fb370e98fe8f2c87e2bb3a5554195b08e20' 
  AND token = 'FccyVrBYCNcC6rMyOkF71KxwlaC3y3GNkUQzGh6BNTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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