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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b796037d6ccccca1f90c19061bb68bbb25ab8efd98bd1794d6d0588388181b' 
  AND token = 'L13Y0NZXpYJjc8NlALSefWjQui1y69oeQujMBy/TP5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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