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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb69ae4fe41ce2d79201d14884f01f6c797e77a4b0594aa9375f51fbfe15527c' 
  AND token = '7BH0ZrVJvCc9HYU5cdgf1JtPZZhPz5OJqw354VEHPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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